Hey dude, I hate to break it to you but sometimes that's just the way dating goes.

It is tough trying to have a first date on a weekend, because people who have an active social life tend to be busy on the weekends. Weekdays are typically better, but since you're both young I don't know how viable that is for you.

On the other side, if a girl likes you - like really likes you, then she will find the time for you. She will be excited to spend time with you and she'll make it happen. Sometimes people are legitimately busy, and sometimes constantly asking them out does work, but you have to ask yourself if it's really worth it.

If it were me, I'd look at your proposals of Saturday and Sunday as two tries. For me, that's as much as a girl gets. If I really think I'm missing something then I maybe ask a third time, but definitely not more than that. You asked her twice, and then put the ball in her court. I agree, I wouldn't expect much to come of it. If she wanted to go out with you, she'd find a way.

I don't know why. Girls are fickle, man. She might like you. Maybe she has trouble coming to grips with the fact that things might get serious. Maybe she has other shit going on in her life. Maybe she just isn't sure any more. Who knows. I'd leave things where they are, not ask her out again, and slowly distance yourself from her. Don't burn bridges if you can help it (something I need to work on), but don't pursue it any further. She knows what you want. She'll know why you're withdrawing. At some point she'll either want to pursue things further, or be happy to let them fade.